From: Tony Battersby <tonyb@cybernetics.com>
To: Matthew Wilcox <willy@infradead.org>,
Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Sathya Prakash <sathya.prakash@broadcom.com>,
Chaitra P B <chaitra.basappa@broadcom.com>,
Suganath Prabu Subramani <suganath-prabu.subramani@broadcom.com>,
iommu@lists.linux-foundation.org, linux-mm <linux-mm@kvack.org>,
linux-scsi <linux-scsi@vger.kernel.org>,
MPT-FusionLinux.pdl@broadcom.com
Subject: Re: [PATCH v2 2/9] dmapool: cleanup error messages
Date: Fri, 3 Aug 2018 13:03:17 -0400 [thread overview]
Message-ID: <a2e9e4fd-2aab-bc7e-8dbb-db4ece8cd84f@cybernetics.com> (raw)
In-Reply-To: <20180803162212.GA4718@bombadil.infradead.org>
On 08/03/2018 12:22 PM, Matthew Wilcox wrote:
> On Fri, Aug 03, 2018 at 06:59:20PM +0300, Andy Shevchenko wrote:
>>>>> I'm pretty sure this was created in an order to avoid bad looking (and
>>>>> in some cases frightening) "NULL device *" part.
>> JFYI: git log --no-merges --grep 'NULL device \*'
> I think those commits actually argue in favour of Tony's patch to remove
> the special casing. Is it really useful to create dma pools with a NULL
> device?
>
>
dma_alloc_coherent() does appear to support a NULL dev, so it might make
sense in theory.A But I can't find any in-tree callers that actually
pass a NULL dev to dma_pool_create().A So for one of the dreaded (NULL
device *) messages to show up, it would take both a new caller that
passes a NULL dev to dma_pool_create() and a bug to cause the message to
be printed.A Is that worth the special casing?
next prev parent reply other threads:[~2018-08-03 17:03 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-02 19:57 Tony Battersby
2018-08-03 8:56 ` Andy Shevchenko
2018-08-03 13:41 ` Tony Battersby
2018-08-03 15:17 ` Tony Battersby
2018-08-03 15:59 ` Andy Shevchenko
2018-08-03 16:01 ` Andy Shevchenko
2018-08-03 16:10 ` Tony Battersby
2018-08-03 16:22 ` Matthew Wilcox
2018-08-03 17:03 ` Tony Battersby [this message]
2018-08-03 18:38 ` Andy Shevchenko
2018-08-03 18:44 ` Tony Battersby
2018-08-03 19:07 ` Douglas Gilbert
2018-08-03 18:43 ` Tony Battersby
2018-08-03 21:07 ` Matthew Wilcox
2018-08-03 21:18 ` Tony Battersby
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